Temperature and Humidity Sensor
DHT11 is one of the commonly used sensor module for Temperature and Humidity measurement. It is lab calibrated and provides digital output. DHT11 consist of a NTC temperature measurement component, a resistive type humidity measurement component and a high performance 8-bit microcontroller inside. It outputs data every 2 seconds. It is highly reliable and robust.
Temperature Humidity Sensor – AM2301
AM2301 is a digital temperature and humidity sensor module made using a capacitive humidity sensor, a high precision temperature sensor and an 8 bit microcontroller. Former name of this sensor was DHT21. This module provides extremely accurate outputs as it is digitally calibrated using the coefficients stored in the microcontroller. It has a wide operating voltage range, 3.3V ~ 5.2V makes its interface easy with a wide variety of devices. AM2301 sensor module can be easily interfaced with Arduino Boards, Raspberry Pi and other microcontroller units with its single bus interface.
Waterproof Digital Temperature Sensor DS18B20
This is a waterproofed and prewired version of DS18B20. The DS18B20 is a high precision one wire digital temperature sensor providing 9-bit to 12-bit Celsius temperature measurements and has an alarm function with non-volatile user programmable upper and lower trigger points. The DS18B20 communicates over a 1 wire bus. It has an operating temperature range of -55°C to 125°C and is accurate to +-0.5°C over the range of -10°C to 85°C. . Each DS18B20 has a 64 bit serial code enabling multiple DS18B20 to be connected to the same 1 wire bus.